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Confidence Intervals for Means and Proportions, Exams of Mathematics

University of Houston – Downtown (UHD)Mathematics

Confidence Intervals for Means and Proportions

Typology: Exams

2022/2023

Uploaded on 04/23/2024

roy-roy1 🇺🇸

1 / 7

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You scored 42 out of 49 Question 1 Your answer is CORRECT. An electrical firm manufactures light bulbs that have a length of life that 1s approximately nomnally distributed with a standard deviation of 40 hours. How large a sample is need if we wish to be 99% confident that we will be within 10 hours of the true mean? a) 84 by (22 ©) © 107 a1 e) 124 f) _ None of the above.